# Pastebin EyujZdGQ
@SuppressWarnings("GroovyAssignabilityCheck")

def call(body) {
    def config = [:]
    body.resolveStrategy = Closure.DELEGATE_FIRST
    body.delegate = config
    body()

    def creds = config.creds ? config.creds : [:]
    
    pipeline {
        stages {
            stage('Doing stuff') {
                steps {
                    script {
                        deployCreds.each {
                            def paramProd = credentials("${it.value['prod']}")
                            def paramDev = credentials("${it.value['dev']}")
                            // Do stuff the creds
                        }
                    }
                }
            }
        }
    }
}